CVE-2026-26230

3.8 LOW

Published: March 16, 2026 Modified: March 18, 2026

Description

Mattermost versions 10.11.x <= 10.11.10 fail to properly validate permission requirements in the team member roles API endpoint which allows team administrators to demote members to guest role. Mattermost Advisory ID: MMSA-2025-00531

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

https://mattermost.com/security-updates

Source: responsibledisclosure@mattermost.com

Vendor Advisory

1 reference(s) from NVD

Quick Stats

CVSS v3 Score

3.8 / 10.0

EPSS (Exploit Probability)

0.0%

6th percentile

Exploitation Status

Not in CISA KEV

Weaknesses (CWE)

CWE-863

Affected Vendors

mattermost

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